<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 消除浏览器默认的margin和padding */

        * {
            margin: 0;
            padding: 0;
        }

        .box {
            display: inline-block;
            width: 200px;
            height: 200px;
            background-color: pink;
            margin: 10px;
        }
    </style>
</head>

<body>
<div class="box"></div>
</body>

</html>